Valve-operating mechanism



May 28, 1929. A. NUTT 1,714,807

VALVE OPERATING MECHANISM Original Filed Feb. 14, 1925 INVENTOR ARTHUR NOTT- A TTORNEY characters denote like or corresponding parts,

Fig. 1 1s a side elevation of the valve op'er- 'trated in Figs. 1 to 3,

the cylinders 11 of the motor Fatented May 28, 1929.

ARTHUR NUTT,-OF 'KENMORE, NEW YORK, ASSIGNOR T0 CURTISS 'AEROPLANE & 1 MOTOR COMPANY, -INC., CORPORATION 0 vAtvn-orns'arine MECHANISM.

Refile for abandoned application serial No. 9,166,

February 14, 1927'.

My invention relates to valve operating mechanism for internal combustion motors and is concerned more particularly with a valve tappet arrangement in which the'several valve tappets are so formed and so related to the intake valves and to the exhaust valves of the motor as to admit of the proper operation of said valves, even tho such valves are disposed respectively at opposite sides of a plane passing thru the axes of the motor cylinders, by means of devices movable about an axis common to the total number thereof. Preferably, each valve tappet includes a stem portion and a head portion extending off from said stem portion at substantially a right angle, said head portion, intermediately of its free end and said stem, having formed thereon a bearing surface upon which on eof the actuating dcvices'is adapted to act.

In the drawings, wherein like reference ating mechanism of one cylinder of a multicylindcr internalcombustion motor, the cylinder block or casting being shown in section;

Fig. 2 is an end view of the valve operating mechanism; the cam shaft of the cylinder block or castings being shown in transverse section;

Fig. 3 is a plan view of the mechanism illustrated in Fig. 1; v

Fig. i is a plan view, similar to Fig. 3, of a modification; rocker arms as distinguished from the cam shaft being shown as the valve operating means;

Fig. 5 is a view similar to Fig. 1, further illustrating said modification, and

Fig. .6 is an end view of such modification.

In the embodiment of the invention illus inclusive, 1O designates the cylinder block or casting within which (but one of which is shown) are formed. Preferably, the cylinders 11 are cast en bloc. Each cylinder 11 is provided with an exhaust valve wort 12, and an intake valve port 13, said ports being so formed in the cylinder casting as to open outwardly and dicated in Figs. 2 and 3. the intake and exhaust ports 12 and 13 are so related one to the other and to the cylinder casting as to overlap or extend beyond the plane of the axes of the motor cylinders, such plane of the axes of the cylinders,

stems of the intake valves 17 are similarly ex- ,tially a right angle to overlap,

oppositely as in- Viewed in plan,

F NEW YORK.

filed February 14; 1925. This application filed Serial No. 168,205. j

an overlap being conducive to maximum port areawhere only two valves per motor cylinder are used. In high speed motors, and especially in aeronautical internal combustion motors, maximum'port area is most desir-.

able. Hereto'fore, to provide for V the proper operation of i the intake and exhaust valves of a motor having its ports thus formed,separate cam shafts have been provided for each cylinder block orcasting', the one cam shaft being adapted to operate the one set of valves and the other cam shaft the other set of valves in view of the fact that such valves are disposed respectively atopposite sides of the plane above mentioned. In the present invention, instead of providing separate cam shafts for each set of valves, but a single cam shaft is provided. Such shaft is designated as 14, while the cams fastened to or formed upon it are designated as 15 a separate cam being provided for'each Valve regardless of the total number thereof.

The valves of the motor are conventional construction. The exhaust valves 16 have the stem portions thereof ex- ATENT A oFFIC L- of more or less thru the cylinder head block atone side ofthe whereas the tended on the opposite side of said plane, and as the cam shaft is disposed symmetrically with respect to said plane, obviously the valve stems are arranged respectively at opposite sides of the. cam shaft.

To admit of the proper operation of the valves thus opposed, valve tappets 18 are provided. Each tappet includes a stem or shank portion 19, a head portion 20 and a bearing surface 21, said head portion 20 being extended off from the stem portion at substanand consequently intersect theplane of the motor cylinder axes. Bearing surface 21 is preferably of arcuate form-and is formed upon the headportion of the valve tappet at a point near its juncture with the'stem. An appropriate guide 22 is provided for each valve tappet. r i i It will be seen from theabove, taken in connection with the accompanying drawing, that the valve tappets, while identical in form,

extend beyond u have their head pontions extendedioppositely; one group or set being extended away from the valve stems thereof in one direction,

Whereas the; other, group or set extend away.

from the valve stems-thereof in the opposite direction; such an arrangement causing the bearing surfaces of the total-number of tappets to line up longitudinally of the motor directly beneath t lie operating cam shaft 14.

In the modification of, Figs. 4 to 6, inclusive, the valve arrangement is exactly as in the preferred.embodiment of'the invention illus tr'a'ted in Figs. 1 to 3. In said modification, however,,mste ad eta-s ngle cam shaft, being provifdedito actuate thevalve tappets and consequentliy. the valves, rocker arms23are used. Tlie ro'cker, arms 23 andzineacliinstance are so arranged as are in eachinstance identail in its present preferred embodiment, it. willbe'obvious to thoseskillediin theart after understanding my invention, that various ehangesand modifications may be made therein Without departing; from the spirit or scope thereofl E aim in theappended, claims to cover all such modifications andchanges.

What I claim is: 1. Invvalve operating-mechanism;for inter.-

nal.combustion.1notors,a valve tappet including a reciprocal stem portion and a rigid head portionreeiprocal with said stem portion and extending off therefrom substantially a right angle, a guide. for sai'dstein portion disposed at one side ola plane passing thru the axis of the cylinder with which said. valve tapp et is associated, said head portion being extended across andbeyond'said plane,'a valve oper-.

able under the action, of said head portion, sai'dval've being disposedfon the opposite side of'said'plan'e from saidguide, and an operat ing means rm: the val e tappet engageable with saidfhead portionintermediately of its free endand'said'steim v 2; In valve operating mechanism for internal combustion motors, an intake valve and an exhaust valve disposedrespectively at opposite sides] ofthe plane of the axis of the motor cylinder which said'valves collectively serve, valve tappets,one foreach valve, each tappet including a reciprocal stem portion and a head portion reciprocal with said stem portion and extending ofi therefromat an an:- gle, said valve tappet stems being likewise disposed respectively at opposite sides of" the plane of. sai'd'eylind'er axis,andian operating 7 means common to the total number ofvalve tappets and engageable withsaid headQportions to actuate saidvalves. v

In testimony whereof I hereunto affix my signature.

ARTHUR N 'UTTT 

